moffatt and r



J. R. MOFFATT AN,D"'R. S'. KELSO. THREAD N|PPE'R. APPLICATION FILED SEPT- 26, 1917- 1 12,799. Patented Aug. 12,1919.

4 SHEETSSHEET l.

J. R.YMOFFATT AND R. s. 'KELSO.

THREAD NIPPER.

APPLICATION FILED SEPT- 26. I917.

Patented Aug. 12; 1919.

4 SHEEITSSHEET 2.

- wueuloz will athnnlqs J. R-LMOFFATT AND R. S. KE LSO.

THREAD NIPPER. APPLICATION FILED SEPT- 26, I917- 1,3 12,799. Patented Aug. 12,1919.

' EETs-suEET 3.

-J. R. MOFFATT AND R. S. KELSO.

THREAD NlPPE R.

APPLICATION FILED SEPT- 26, 1917.

Batented Aug. 12, 1919.

4 SHEETS-SHEET 4.

UNITED STATES PATENT onrncn JAMES R. MOFFATT AND RALPH S. KELSO, OF CHICAGO, ILLINOIS, ASSIGNOBS 'IO UNION SPECIAL MACHINE COMPANY, OFOI IICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

THREADI-NIPPER.

To all whom it may concern:

Be it known that we, JAMES R. MOFFATT and RALPH S. KELso, citizens of the United States, residing at Chicago, in the county of Cook, State of Illinois, haveinvented certain new and useful Improvements in ThreadeNippers, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon. I

The invention relates to an improvement in a device for controlling a plurality of needle threads of amulti ple needle sewmg machine.

15, 1912, andembodies specific improvements to thepatent granted to J, R. Moifatt, 1139793 patented May 18, 1915.

One of the objects of he present mven tion is to provide a thread nipping or clamping device which includes a plurality of clamping disks which are normally pressed apart to permit the free passage of the threads between the respective disks and to provide thread guides for directing the threads across the centers of said disks, whereby said disks when urged together, will nip the threads with equal'force.

Another object of the invention is to provide a holder for the disks which is substan- I for the. disks being shown in section;

;.Fig. 4 isia'cross sectional View thereof; v

Fig. 5 is a view showing in'perspective the various parts of the thread nipping dev1ce,

The invention is broadly directed to the, samesubject matter. disclosed in the patent to D. W. Corey, 10 11597, patented October dom of action, for the disks.

Fig. 3 is an enlarged elevation, the holder Specification of Letters Patent. -Pa ,tentedAug; '12, 1919. Application filed September 26, 1917. Serial No. 193,362.

portion of the time the needle eyes are below the fabric so as to insure the proper setting of the stitches by certain thread controlling ranged inparallel relation. The holder is formed with thread guides which are so arranged that the respective threads are led between corresponding pairs of disks and across the ax s thereof. A lever, fulcrumed on the holder, is actuated by the needle lever to force the disks against a variable tension spring, and thereby simultaneously clamp 'or nip each of the several threads. The; lever carries a diskwhich has bodily move-Q ment toward and from the floating disks, and as a result, when the lever is moved in a direction for nipping the threads, all of said disks are moved and their parallelism is maintained, thus insuring positive action.

on all the, threads by said disks. Directly under the disks, the holder is formed with an open ng ofasize sufficient to readily permit the thread lint passing outwardly,

from the holder, "and thereby insure a free- 1 Referringmore in detail .to the drawings, we have shown our improvements as applied to a sewing machine having a. supporting Q bed 1 carrylng an overhanging arm 2 in which a needle bar Sreciprocates. This needle bar is provided, as herein shown, with a plurality of needles 4:. The needle bar is reciprooated by'a needle lever 5 which is; connected thereto by a vlink 6. Thi s needle lever is oscillated by an eccentric on the main shaft, I Cotipcrating with the .re-.

spective needles are loopers 7 which are.

oscillated by a link 9 'pivotally J connected to the needle lever extensionlO. Suitably mounted on the-bed 1 is aworksupport11 havin g suitable feed". slots for the reception of a feed dog 12 of the four-motion type which is operated in the usual manner. C0-

' operating with the work support is a'presser foot13 carried by a presser bar 14 which is slidably mounted in suitable bearings in the overhanging arm 2. against the fabric being sewed bya spring 15, and moves up and down with the feed dog and also with fabrics of different thick- This foot is lield.

The needle threads are led from the supply through individual tensions 16 m0unted on the overhanging arm, through suit able guides 17 on the overhanging arm, thence through the eyelet 18 on the controlling lever 19, thence through the thread guide 20 mounted on the needle lever, and finally through the thread guide 21 mounted on the needle bar 3 to the respective needles. The controlling lever.19 is fulcrumed on the overhanging arm'an'd engages a fixed segment22 adjustably mounted on the presser bar. The movement of the eyelet l8, relative to a line passing through the thread guides 17 and 20, determines the amount of thread pulled thereby through the tensions from the supply, and consequently determines the amount of'thread employed in the successive stitches when sewing upon ordinary materials. The above parts are all of well known construction.

It sometimes happens when sewing certain materials, such as leather, that the needle thread will, when said needle'is passing downwardly, become pinched between the needle and the sideof the opening formed thereby, and, if the resistance is greater at this point than at the tension, an excessive tension. This excess thread will of course be embodied in the succeeding stitch, and this stitch will consequently be looser than the others.

Secured to the inner face of the overhanging arm 2 is a supporting plate 23 of the thread'nipper, and fixed to this plate is a forwardly extending tubular holder 24 for a series of clamping disks 25 which are arranged in parallel relation. The inner disk is secured to the'upper end of an actuating lever 26 which is fulcrumed in the plate 23. The outerdisk carries a fixed pin 27 which extends forwardly through an opening 28 formed in a stop plug 29. This plug is adjustably secured in the outer end of the holder by a screw 30. Disposed between the outer disk 25 and said stop plug 29, is a coil spring 31 which surrounds the pin 27. The opening 28 forms a guide for the pin 27 and thereby maintains the attached disk in a vertical plane. Lock nuts 32 are secured to the outer end of the pin 27 and bear against the stop plug 29 to limit the inward movement of the inner disk through the action of the spring 31. The upper portion of the holder is recessed as at 33 and formed in the opposite walls thereof are downwardly extending thread slots 36L which terminate in thread guides 35. These guides are arranged in pairs for the respective threads and are disposed in a horizontal plane containing the major axis of the holder to cause the threads to pass across the axes of said disks. The slots 34 permit the holder to be readily threaded.

Fixed to the needle lever 5, is a plate 36 and adjustably secured to the lower end thereof is a shoe 37 which is adaptcd on' downward movement of the lever, to engage a block 38 carried on the lower end of the nipper lever 26 and thereby actuate the latter.

In operation, as the needle lever is reaching the lower end of its stroke, the nipper lever 26 will be oscillated, and the disks 25 will be moved forwardly and against the" spring 31, said spring being thereby compressed and the threads nipped and held controlling mechanism. By means of the adjustable stop block 29, the clamping action of the disks on the threads may bereadily varied to suit conditions.

Directly below the disks, the holder is formed with an opening 39 of a size sufii} cient to permit the lint passing out' of the holder and thereby insure theproper work ing of the nipping device.

Having thus described our invention what we claim as new and desire to secure by Letters Patent, is y 1. In a multiple thread nipping device,

the combination with a tubular holder, of a plurality of clamping disks loosely mounted therein and supported thereby, a tension" spring disposed within said holder and" 10-" cated at one end thereof, said holder being provided with means for leading the threads between the several disks, and means" for moving said dlsks against thespring for clamping said threads.

2. In a multiple thread nipping device,

the combination with a tubular holder, of'a plurality of clamping disks loosely supported therein, a tension spring disposed within said holder and located at one end thereof, said holder being provided with means for leading the threads between the" several disks, and means for -moving; said disks against the'spring for'clampingsaid threads, said means including an aotua'ti-ng lever having connection with the disk farthest removed from said spring.

3. In a multiple thread nipping device, the combination with a tubular holder, a stop' plug secured within one end of the holder, a plurality of clamping disks sup ported within said holder, a tension spring located within the holder between said stop plug and said disks, means for leading the threads between the several'disks, and means for moving said disks against the spring for clamping said threads.

4:. In a multiple thread nipping device, the combination with a tubular holder, a stop plug secured within one end of the holder, a plurality of clamping disks supported Within said holder, a tension spring located Within the holder between said stop plug and said disks, means for leading the threads between the several disks, and means for moving said disks against the spring for clamping said threads, and a guide pin fixed to the end disk and extending through said stop plug.

5. In a multiple thread nipping device, the combination With a tubular holder, of a plurality of clamping disks looselyvmounted therein and supported thereby, a tension spring located Within the holder and engag- 111g said disks, said holder being horlzontally disposed and having formed in its under face openings for the egress of lint.

6. In a multiple thread nipping device,

I Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

for clamping the threads, and means for moving the abutment to release the threads from tension.

In testimony whereof, We affix our signatures, in the resence of tWo Witnesses.

JAMES R. MOFFATT. RALPH S. KELSO.

Witnesses:

A. H. SIMMONS, J. W. KENNEDY.

Washington, D. G3. 

